This is Perl module Number::ZipCode::JP.
INSTALLATION
Number::ZipCode::JP installation is straightforward. If your CPAN shell is set up,
you should just be able to do
% cpan Number::ZipCode::JP
Download it, unpack it, then build it as per the usual:
% perl Makefile.PL
% make && make test
Then install it:
% make install
DOCUMENTATION
Number::ZipCode::JP documentation is available as in POD. So you can do:
% perldoc Number::ZipCode::JP
to read the documentation online with your favorite pager.
Koichi Taniguchi